Using Switch Statement to Handle Button Clicks

Question

I m trying to wrap my head around Views  Listeners etc   I have an Activity with 2 Buttons  buttonplay and buttonstop   My problem is I can t wrap my head around the Views and Listeners completely enough to generate a working switch statement   For example  I would LIKE to create a SINGLE Listener and somehow use it to determine which button is clicked   Then somehow use the ID of the button clicked in my switch statement   But everything I find online seems to use SEPARATE listeners for every button and then somehow use the View as the argument to the Switch statement   I realize the code below is not correct  but am looking for what changes I would need to accomplish the above   I want to control the MediaPlayer depending on which button is clicked   I have      Button b1    Button  findViewById R id buttonplay              b1 setOnClickListener new View OnClickListener                           public void onClick View v                  Perform action on click           switch v getId                case R id buttonplay              Play voicefile           MediaPlayer create getBaseContext    R raw voicefile  start              break            case R id buttonstop              Stop MediaPlayer               MediaPlayer create getBaseContext    R raw voicefile  stop              break                            Ultimately I would like the most straighforward way to switch on whatever button is clicked  I believe a big part of my confusion stems from the way onClickListeners and Views are used in this context

User · Answer

Hi its quite simple to make switch between buttons using switch case -   package com example browsebutton        import android app Activity      import android os Bundle      import android view View      import android view View OnClickListener      import android widget Button      import android widget Toast           public class MainActivity extends Activity implements OnClickListener           Button b1 b2               Override             protected void onCreate Bundle savedInstanceState                    super onCreate savedInstanceState                   setContentView R layout activity main                   b1  Button findViewById R id button1                    b2  Button findViewById R id button2                   b1 setOnClickListener this                   b2 setOnClickListener this                                 Override             public void onClick View v                       TODO Auto-generated method stub                   int id v getId                     switch id                        case R id button1                    Toast makeText getBaseContext     btn1   Toast LENGTH LONG  show                      Your Operation                    break                       case R id button2                            Toast makeText getBaseContext     btn2   Toast LENGTH LONG  show                                  Your Operation                           break

User · Answer

I use Butterknife with switch-case to handle this kind of cases        OnClick  R id button bireysel  R id button kurumsal           public void onViewClicked View view                switch  view getId                        case R id button bireysel     Do something                      break                  case R id button kurumsal          Do something                      break                             But the thing is there is no default case and switch statement falls through

User · Answer

Just change the class  I suppose it s the main Activity  to implement View OnClickListener and on the onClick method put the general onClick actions you want to put   public class MediaPlayer extends Activity implements OnClickListener     Override public void onCreate Bundle savedInstanceState        Button b1    Button  findViewById R id buttonplay              b1 setOnClickListener this          YOUR APP       Override public void onClick View v           Perform action on click     switch v getId          case R id buttonplay            Play voicefile         MediaPlayer create getBaseContext    R raw voicefile  start            break      case R id buttonstop            Stop MediaPlayer         MediaPlayer create getBaseContext    R raw voicefile  stop            break              I took it from this video  http   www youtube com watch v rm-hNlTD1H0   It s good for starters

User · Answer

One way of achieving this is to make your class implement OnClickListener and then add it to your buttons like this   Example     make your class implement OnClickListener public class MyClass implements OnClickListener                          Create your buttons and set their onClickListener to  this          Button b1    Button  findViewById R id buttonplay              b1 setOnClickListener this            Button b2    Button  findViewById R id buttonstop              b2 setOnClickListener this                           implement the onClick method here         public void onClick View v                  Perform action on click           switch v getId                  case R id buttonplay                  Play voicefile               MediaPlayer create getBaseContext    R raw voicefile  start                  break              case R id buttonstop                  Stop MediaPlayer               MediaPlayer create getBaseContext    R raw voicefile  stop                  break                           For more information see Android Developers   Handling UI Events

User · Answer

XML CODE FOR TWO BUTTONS         lt Button             android id    id btn save              android layout width  match parent              android layout height  wrap content              android text  SAVE              android onClick  process                gt           lt Button             android id    id btn show              android layout width  match parent              android layout height  wrap content              android text  SHOW              android onClick  process   gt      Java Code   lt pre gt  public void process View view                switch  view getId                     case R id btn save                      add your own code                     break                  case R id btn show                       add your own code                     break                lt  pre gt

User · Answer

One mistake what i did was not including  implements OnClickListener  in the main class declaration  This is a sample code to clearly illustrate the use of switch case during on click  The code changes background colour as per the button pressed   Hope this helps   public class MainActivity extends Activity  implements OnClickListener    TextView displayText  Button cred  cblack  cgreen  cyellow  cwhite  LinearLayout buttonLayout    SuppressLint  NewApi    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity main        cred    Button  findViewById R id bred       cblack    Button  findViewById R id bblack       cgreen    Button  findViewById R id bgreen       cyellow    Button  findViewById R id byellow       cwhite    Button  findViewById R id bwhite       displayText    TextView  findViewById R id tvdisplay       buttonLayout    LinearLayout  findViewById R id llbuttons        cred setOnClickListener this       cblack setOnClickListener this       cgreen setOnClickListener this       cyellow setOnClickListener this       cwhite setOnClickListener this       Override protected void onClick View V       int id V getId        switch id       case R id bred          displayText setBackgroundColor Color rgb 255  0  0            vanishLayout            break      case R id bblack          displayText setBackgroundColor Color rgb 0  0  0            vanishLayout            break      case R id byellow          displayText setBackgroundColor Color rgb 255  255  0            vanishLayout            break      case R id bgreen          displayText setBackgroundColor Color rgb 0  255  0            vanishLayout            break      case R id bwhite          displayText setBackgroundColor Color rgb 255  255  255            vanishLayout            break

User · Answer

I have found that the simplest way to do this is to set onClick for each button in the xml   lt Button android id    id vrHelp  android layout width  wrap content  android layout height  wrap content  android background   drawable ic menu help  android onClick  helpB    gt    and then you can do a switch case like this    public void helpB View v        Button clickedButton    Button  v      switch  clickedButton getId            case R id vrHelp          dosomething            break         case R id coHelp          dosomething            break         case R id ksHelp          dosomething            break         case R id uHelp          dosomething            break         case R id pHelp          dosomething            break

[android] Using Switch Statement to Handle Button Clicks

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